turtlebot3_simulations: turtlebot3_drive does not publish to cmd_vel

I am using the melodic version of ROS with an Ubuntu 18.04 system.

I ran into an issue where the burger bot in gazebo, did not move when turtlebot3_simulation.launch file was launched.

When I ran “rqt_graph” node I found out that the “turtlebot3_drive” node did not publish to /cmd_vel topic and also it did not subscribe from /odom and /scan topics too.

I made the following change in the in the “turtlebot3_drive.cpp” file present in the “/turtlebot3_gazebo/src” folder and the issue was solved. I added the turtlebot3_drive.init(); line in the main() function as shown below:

int main(int argc, char* argv[])
{
  ros::init(argc, argv, "turtlebot3_drive");
  Turtlebot3Drive turtlebot3_drive;
  turtlebot3_drive.init();  //the line that I added

  ros::Rate loop_rate(125);

  while (ros::ok())
  {
    turtlebot3_drive.controlLoop();
    ros::spinOnce();
    loop_rate.sleep();
  }

  return 0;
}

Probably it happened because, some compilers do not run the init() function of a class, as soon as it’s object is created.

I thought I could post this here, as if anyone faced the same issue as me could get it sorted.

Thank you.